Daily Water Intake
Personalized estimate + a simple tracker. Click glasses as you drink!
Your Details
Your Target
Note: This is a general estimate. Needs vary with health conditions, pregnancy, and medical advice.
Daily Tracker
How to Use This Water Intake Calculator
- Select your Units (Metric kg or US lb)
- Enter your Weight, Age, and Gender
- Select your Activity Level (Sedentary to Intense) — adds ~350ml per 30 min exercise
- Select Climate (Normal or Hot) — hot climate adds 500ml
- Adjust Glass Size (150-500ml) to match your drinking glass
- View your Estimated Daily Intake in liters and glasses
- Track your intake — click glasses throughout the day to log each glass you drink
- The progress bar shows your daily percentage, and wave animation fills each clicked glass
- Click Reset Today to start over (your progress saves automatically in your browser)
How Water Intake is Calculated (Formula)
Base = Weight (kg) × ml per kg
(Age ≤13: 40ml/kg, Age 14-55: 35ml/kg, Age >55: 30ml/kg)
Activity Adjustment = +350ml per 30 minutes of daily exercise
Climate Adjustment = +500ml if living in hot climate
Gender Adjustment = +300ml for males (higher average lean mass)
Daily Intake (L) = (Base + Activity + Climate + Gender) ÷ 1000
Real Example
Inputs:
- Weight: 70 kg | Age: 30 | Gender: Male
- Activity: Moderate (~1 hour/day) → +700ml
- Climate: Normal | Glass Size: 250ml
Calculation:
- Base: 70 kg × 35 ml = 2,450 ml
- Activity: 60 min ÷ 30 × 350 = 700 ml
- Gender (male): +300 ml
- Total: 2,450 + 700 + 300 = 3,450 ml (3.45 L)
- Glasses needed: 3,450ml ÷ 250ml = ~14 glasses
Water Intake Recommendations by Activity Level
Why Use This Water Intake Calculator?
- ✅ Personalized Calculation — Age, weight, gender, activity, climate — all factor in
- ✅ Daily Tracker — Clickable glasses with wave fill animation to track your intake
- ✅ Progress Bar — Visual percentage of daily goal achieved
- ✅ Auto-Save — Progress saves in your browser, resets automatically each day
- ✅ Custom Glass Size — Adjust to match your actual drinking glass (150-500ml)
- ✅ Science-Based — Uses established hydration guidelines (IOM/EFSA recommendations)
- ✅ Free & Unlimited — No signup required
- ✅ Mobile Friendly — Responsive grid with glass grid that adapts to screen size
Frequently Asked Questions
How much water should I drink daily?
General guidelines (IOM/EFSA):
– Men (19+): ~3.7 L (15.5 cups) total water per day (includes water from food)
– Women (19+): ~2.7 L (11.5 cups) total water per day
– This calculator: Estimates drinking water only (excluding food water content) and adjusts for activity, climate, and individual factors.
Why do males get +300ml?
Males typically have higher lean body mass, which requires more water for metabolic processes. The average male also has larger body surface area, leading to higher insensible water loss (through skin and respiration).
How does exercise affect water needs?
During exercise, you lose water through sweat. For every 30 minutes of moderate-intense exercise, you need approximately 350ml (1.5 cups) of additional water. This calculator automatically adds this based on your activity level.
What about hot climate?
In hot climates, you lose more water through sweat even at rest. This calculator adds 500ml (2 cups) per day for hot climates. If you live in a very humid or extremely hot region, you may need even more.
How do I use the daily tracker?
Each time you finish a glass of water, click on a glass icon. The glass fills with a wave animation, and the progress bar advances. Your progress saves automatically. If you make a mistake, click Reset Today to start over. The tracker resets automatically each day (based on your local date).
Can I drink other fluids besides water?
Yes — tea, coffee (in moderation), milk, and other beverages contribute to hydration. However, sugary drinks, alcohol, and excessive caffeine can have diuretic effects. Water is the best choice for meeting daily hydration needs. This calculator assumes water intake; adjust mentally if consuming other fluids.
Related Health & Fitness Calculators
- BMR Calculator — Basal metabolic rate
- BMI Calculator — Body Mass Index
- Calorie Burn Calculator — Exercise energy expenditure
- Macro Nutrient Calculator — Diet planning
- Body Fat Calculator — Body composition
Disclaimer: This water intake calculator provides estimates for informational purposes only. Individual hydration needs vary based on health conditions, pregnancy, breastfeeding, medications, and medical advice. Always consult a healthcare provider for personalized hydration recommendations, especially if you have kidney, heart, or other medical conditions.